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question_answer1)
A gas expands under constant pressure P from volume \[{{V}_{1}}\]to\[{{V}_{2}}\]. The work done by the gas is [CBSE PMT 1990; RPMT 2003]
A)
\[P({{V}_{2}}-{{V}_{1}})\] done
clear
B)
\[P({{V}_{1}}-{{V}_{2}})\] done
clear
C)
\[P(V_{1}^{\gamma }-V_{2}^{\gamma })\] done
clear
D)
\[P\frac{{{V}_{1}}{{V}_{2}}}{{{V}_{2}}-{{V}_{1}}}\] done
clear
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question_answer2)
When heat in given to a gas in an isobaric process, then [DPMT 2001]
A)
The work is done by the gas done
clear
B)
Internal energy of the gas increases done
clear
C)
Both (a) and (b) done
clear
D)
None from (a) and (b) done
clear
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question_answer3)
One mole of a perfect gas in a cylinder fitted with a piston has a pressure P, volume V and temperature T. If the temperature is increased by 1 K keeping pressure constant, the increase in volume is
A)
\[\frac{2V}{273}\] done
clear
B)
\[\frac{V}{91}\] done
clear
C)
\[\frac{V}{273}\] done
clear
D)
V done
clear
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question_answer4)
A gas is compressed at a constant pressure of \[50N/{{m}^{2}}\] from a volume of \[10{{m}^{3}}\] to a volume of \[4{{m}^{3}}\]. Energy of 100 J then added to the gas by heating. Its internal energy is [MNR 1994]
A)
Increased by 400 J done
clear
B)
Increased by 200 J done
clear
C)
Increased by 100 J done
clear
D)
Decreased by 200 J done
clear
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question_answer5)
Work done by air when it expands from 50 litres to 150 litres at a constant pressure of 2 atmosphere is
A)
\[2\times {{10}^{4}}\]joules done
clear
B)
\[2\times 100\]joules done
clear
C)
\[2\times {{10}^{5}}\times 100\]joules done
clear
D)
\[2\times {{10}^{-5}}\times 100\]joules done
clear
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question_answer6)
Work done by 0.1 mole of a gas at \[{{27}^{o}}C\] to double its volume at constant pressure is (R = 2 cal mol?1 oC?1) [EAMCET 1994]
A)
54 cal done
clear
B)
600 cal done
clear
C)
60 cal done
clear
D)
546 cal done
clear
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question_answer7)
Unit mass of a liquid with volume \[{{V}_{1}}\] is completely changed into a gas of volume \[{{V}_{2}}\] at a constant external pressure P and temperature T. If the latent heat of evaporation for the given mass is L, then the increase in the internal energy of the system is [Roorkee 1999]
A)
Zero done
clear
B)
\[P({{V}_{2}}-{{V}_{1}})\] done
clear
C)
\[L-P({{V}_{2}}-{{V}_{1}})\] done
clear
D)
L done
clear
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question_answer8)
A gas expands \[0.25{{m}^{3}}\] at constant pressure \[{{10}^{3}}N/{{m}^{2}}\], the work done is [CPMT 1997; UPSEAT 1999; JIPMER 2001, 02]
A)
2.5 ergs done
clear
B)
250 J done
clear
C)
250 W done
clear
D)
250 N done
clear
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question_answer9)
Two kg of water is converted into steam by boiling at atmospheric pressure. The volume changes from \[2\times {{10}^{-3}}\,{{m}^{3}}\] to \[3.34{{m}^{3}}.\] The work done by the system is about [Roorkee 2000]
A)
? 340 kJ done
clear
B)
? 170 kJ done
clear
C)
170 kJ done
clear
D)
340 kJ done
clear
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question_answer10)
An ideal gas has volume \[{{V}_{0}}\] at \[{{27}^{o}}C.\]It is heated at constant pressure so that its volume becomes \[2{{V}_{0}}.\] The final temperature is [BCECE 2003]
A)
\[{{54}^{o}}C\] done
clear
B)
\[{{32.6}^{o}}C\] done
clear
C)
\[327\ {}^\circ C\] done
clear
D)
150 K done
clear
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question_answer11)
If 300 ml of a gas at \[{{27}^{o}}C\] is cooled to \[{{7}^{o}}C\] at constant pressure, then its final volume will be [Pb. PET 1999; BHU 2003; CPMT 2004]
A)
540 ml done
clear
B)
350 ml done
clear
C)
280 ml done
clear
D)
135 ml done
clear
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question_answer12)
Which of the following is correct in terms of increasing work done for the same initial and final state [RPMT 1996]
A)
Adiabatic < Isothermal < Isobaric done
clear
B)
Isobaric < Adiabatic < Isothermal done
clear
C)
Adiabatic < Isobaric < Isothermal done
clear
D)
None of these done
clear
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question_answer13)
A sample of gas expands from volume \[{{V}_{1}}\] to\[{{V}_{2}}\]. The amount of work done by the gas is greatest when the expansion is [CBSE PMT 1997; AIIMS 1998; JIPMER 2000]
A)
Isothermal done
clear
B)
Isobaric done
clear
C)
Adiabatic done
clear
D)
Equal in all cases done
clear
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question_answer14)
Which of the following is a slow process [J & K CET 2000]
A)
Isothermal done
clear
B)
Adiabatic done
clear
C)
Isobaric done
clear
D)
None of these done
clear
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question_answer15)
How much work to be done in decreasing the volume of and ideal gas by an amount of \[2.4\times {{10}^{-4}}{{m}^{3}}\] at normal temperature and constant normal pressure of \[1\times {{10}^{5}}N/{{m}^{2}}\] [UPSEAT 1999]
A)
28 joule done
clear
B)
27 joule done
clear
C)
25 joule done
clear
D)
24 joule done
clear
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question_answer16)
A Container having 1 mole of a gas at a temperature 27°C has a movable piston which maintains at constant pressure in container of 1 atm. The gas is compressed until temperature becomes 127°C. The work done is (Cp for gas is 7.03 cal/mol?K) [DCE 2005]
A)
703 J done
clear
B)
814 J done
clear
C)
121 J done
clear
D)
2035 J done
clear
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question_answer17)
In a reversible isochoric change [NCERT 1990]
A)
\[\Delta W=0\] done
clear
B)
\[\Delta Q=0\] done
clear
C)
\[\Delta T=0\] done
clear
D)
\[\Delta U=0\] done
clear
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question_answer18)
Entropy of a thermodynamic system does not change when this system is used for [AIIMS 1995]
A)
Conduction of heat from a hot reservoir to a cold reservoir done
clear
B)
Conversion of heat into work isobarically done
clear
C)
Conversion of heat into internal energy isochorically done
clear
D)
Conversion of work into heat isochorically done
clear
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question_answer19)
The work done in which of the following processes is zero [UPSEAT 2003]
A)
Isothermal process done
clear
B)
Adiabatic process done
clear
C)
Isochoric process done
clear
D)
None of these done
clear
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question_answer20)
In which thermodynamic process, volume remains same [Orissa PMT 2004]
A)
Isobaric done
clear
B)
Isothermal done
clear
C)
Adiabatic done
clear
D)
Isochoric done
clear
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question_answer21)
In an isochoric process if \[{{T}_{1}}={{27}^{o}}C\] and \[{{T}_{2}}={{127}^{o}}C,\] then \[{{P}_{1}}/{{P}_{2}}\] will be equal to [RPMT 2003]
A)
9 / 59 done
clear
B)
2 / 3 done
clear
C)
3 / 4 done
clear
D)
At constant volume \[P\propto T\]Þ \[\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{{{T}_{1}}}{{{T}_{2}}}\]Þ\[\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{300}{400}=\frac{3}{4}\] done
clear
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question_answer22)
Which is incorrect [DCE 2001]
A)
In an isobaric process, \[\Delta p=0\] done
clear
B)
In an isochoric process, \[\Delta W=0\] done
clear
C)
In an isothermal process, \[\Delta T=0\] done
clear
D)
In an isothermal process, \[\Delta Q=0\] done
clear
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question_answer23)
Which relation is correct for isometric process [RPMT 2001; BCECE 2003]
A)
\[\Delta Q=\Delta U\]\[\] done
clear
B)
\[\Delta W=\Delta U\] done
clear
C)
\[\Delta Q=\Delta W\] done
clear
D)
None of these done
clear
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